lm hết nha mn
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HM
5
15 tháng 9 2021
\(\frac{3}{4}\)của 60 là :
\(\frac{3}{4}\times60=45\)
:)))))))))))))))))
DT
3
8 tháng 11 2021
Bài 3:
a. \(R=p\dfrac{l}{S}=1,1.10^{-6}\dfrac{30}{0,2.10^{-6}}=165\Omega\)
b. \(Q=UIt=220\left(\dfrac{220}{165}\right).15.60=254000\left(J\right)\)
8 tháng 11 2021
Bài 2:
a. \(R=\dfrac{U^2}{P}=\dfrac{220^2}{1000}=48,4\Omega\)
b. \(Q=UIt=220\left(\dfrac{220}{48,4}\right).4.3600=14400000\left(J\right)\)
c. \(Q'=Q.40=14400000.40=576000000\left(J\right)=120000\)kWh
\(\Rightarrow T=Q'.2100=120000.2100=252000000\left(dong\right)\)
Q
chứng minh rằng nếu ab+cd+eg chia hết cho 11 thì abcdeg chia hết cho 11
lm giúp mik nha
iu mn nhìu ♥♥♥
2
H
15 tháng 9 2021
Ta có:
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯abcdeg=10000¯¯¯¯¯ab+¯¯¯¯¯¯¯¯100cd+¯¯¯¯¯egabcdeg¯=10000ab¯+100¯cd+eg¯
=9999¯¯¯¯¯ab+99¯¯¯¯¯cd+¯¯¯¯¯ab+¯¯¯¯¯cd+¯¯¯¯¯eg=9999ab¯+99cd¯+ab¯+cd¯+eg¯
=(9999¯¯¯¯¯ab+99¯¯¯¯¯cd)+(¯¯¯¯¯ab+¯¯¯¯¯cd+¯¯¯¯¯eg)=(9999ab¯+99cd¯)+(ab¯+cd¯+eg¯)
=(11.909.¯¯¯¯¯ab+11.9¯¯¯¯¯cd)+(¯¯¯¯¯ab+¯¯¯¯¯cd+¯¯¯¯¯eg)=(11.909.ab¯+11.9cd¯)+(ab¯+cd¯+eg¯)
=11(909.9.¯¯¯¯¯ab.¯¯¯¯¯cd)+(¯¯¯¯¯ab+¯¯¯¯¯cd+¯¯¯¯¯eg)=11(909.9.ab¯.cd¯)+(ab¯+cd¯+eg¯)
Mà: ⎧⎪ ⎪⎨⎪ ⎪⎩11(909.9.¯¯¯¯¯ab.¯¯¯¯¯cd)⋮11(¯¯¯¯¯ab+¯¯¯¯¯cd+¯¯¯¯¯eg)⋮11{11(909.9.ab¯.cd¯)⋮11(ab¯+cd¯+eg¯)⋮11
⇒11(909.9.¯¯¯¯¯ab.¯¯¯¯¯cd)+(¯¯¯¯¯ab+¯¯¯¯¯cd+¯¯¯¯¯eg)⋮11⇒11(909.9.ab¯.cd¯)+(ab¯+cd¯+eg¯)⋮11
Hay ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯abcdeg⋮11abcdeg¯⋮11 (Đpcm)
H
1
DT
Đỗ Thanh Hải
CTVVIP
5 tháng 11 2021
2 she had got the price of the contest, she would be happy now
3 I had gone to the concert last night ,I would be tired
4 John had finished all his homework, he could see a movie now
5 we had listened to my mother, we wouldn't be in trouble right now
Ex5
1 you arrive at the offcie earlier than I do, please turn on the air-conditioner
2 Were it not snowy, the children would go to school
3 he not died so young, he would be a famous musician
4 Were I you, I would take care of my car
5 not very bad-tempered, his wife would give him soon are marrage
6 Had she not got married at such an early age, he would be at university
1 B
2 D
II
1 B
2 A
3 A
III
1 B
7 B
8 D
9 B
10 B
11 D
12 C